双重动态键协同增强聚芳醚腈复合材料的制备及性能研究

Preparation and properties of poly(aryl ether nitrile)composite reinforced by dual dynamic bond

通过动态硼氧键和氢键的共价/非共价协同增强的方法制备了动态硼氧键交联聚芳醚腈(PEN-COOH-B_(3)O_(3))/聚乙烯吡咯烷酮(PVPON)复合材料。并用万能拉伸试验机,差示扫描量热仪等仪器手段对复合材料的力学性能,形状记忆功能,热稳定性,自愈合性能和循环回收性能进行了一系列表征与研究。利用PEN-COOH-B_(3)O_(3)/PVPON之间的氢键作用制备的复合材料强度可达102.5 MPa,弹性模量达3455.7 MPa,玻璃化转变温度T_(g)达180.3℃。动态硼氧键的加入使得复合材料具有优异的溶剂辅助自修复和回收性能,在经过常温(25℃)自愈合24 h后愈合效率达98.7%,经历五次循环回收力学性能无损失。同时,利用动态硼氧键的刺激响应性,该复合材料表现出良好的形状记忆行为。

The dynamic boroxine crosslinked poly(aryl ether nitrilene)(PEN-COOH-B_(3)O_(3))/polyethylpyrrolidone(PVPON)composites were prepared by the covalent/non-covalent co-enhancement of dynamic boroxine and hydrogen bonds.The mechanical properties,shape memory function,thermal stability,self-healing properties and recycling properties of the composites were characterized and studied by means of universal tensile testing machine,differential scanning calorimeter and other instruments.The strength of the composite prepared by the hydrogen bond between PEN-COOH-B_(3)O_(3)/PVPON can reach 102.5 MPa,the elastic modulus can reach 3455.7 MPa,and the glass transition temperature can reach 180.3℃.The addition of dynamic boron-oxygen bond made the composite have excellent solvo-assisted self-healing and recovery properties.The healing efficiency reached 98.7%after 24 h of self-healing at room temperature(25℃),and there was no loss of mechanical properties after five cycles of recovery.At the same time,the composite exhibits good shape memory behavior by utilizing the stimulus response of dynamic boroxine bond.